JP2508051Y2 - Work feeder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work feeding device used for various machine tools for woodworking.

[0002]

2. Description of the Related Art In various woodworking machine tools such as a double sizer, a mortise picking machine, and a picking machine, a workpiece feeding device, a so-called work feeding device, is provided with a caterpillar chain which is driven in a horizontal position and above it. It is often used that two sets of left and right are combined with the endless belt for pressing the work of the lifting structure. The height of the caterpillar chain is constant, but if the height of the work placed on the caterpillar chain changes, the arrangement height of the upper endless belt must be changed. As the arrangement height changing mechanism, a so-called screw type in which an endless belt is mounted on a vertical guide rail, and a square screw spindle and a bush with an internal thread to be screwed onto the square screw spindle are combined between the endless belt and the guide rail, are used. Most of the configurations use a lifting mechanism. The height of the endless belt is determined by attaching a scale plate and a pointer between the guide rail and the guide rail, and rotating the square screw spindle while reading the scale.

[0003]

However, the above-mentioned conventional work feeding device has a drawback that the operation at the time of setup change is complicated and requires skill. That is, the operation of rotating the square screw spindle to change the arrangement height of the endless belt naturally increases the rotation amount of the square screw spindle as the change width increases, and the operation is complicated and time-consuming. Also, skill is required to accurately determine and fix the screw height in consideration of the screw backlash. Coil springs for generating pressing force are installed on the back of the endless belt, and there is some relief, but if there are too many errors in the placement height, the work force will rise due to insufficient pressing force and the machining accuracy will increase. May make things worse. The present invention provides a work feeding device having a structure capable of swiftly and reliably adjusting the arrangement height of the endless belt even when the height of the work changes and always providing a constant pressing force. With the goal.

[0004]

SUMMARY OF THE INVENTION A work feeding device according to the present invention comprises a caterpillar chain which is driven in a lateral position and an upper part of the caterpillar chain for pressing a top surface of a work placed on the caterpillar chain. And place
A work feed device in combination with an endless belt having a lifting structure, the first limit switch having a work entry detection sensor arranged on the side of the caterpillar chain and for detecting entry of the work, and the endless belt. Disposed on the side, a second limit switch having a work pressing sensor for detecting that the endless belt presses the upper surface of the work with a preset pressing force, and the first limit switch is the work When the entry is detected, the endless belt is started to descend, and when the second limit switch detects a preset pressing force, the lifting cylinder is configured to stop the endless belt from descending.

[0005]

Operation: A lifting cylinder is used as a driving source for lifting the endless belt. The first limit switch arranged on the caterpillar chain side inputs the work entry detection signal of the sensor as an endless belt descent start command to the control circuit, and moves the lifting cylinder to start the descent of the endless belt. Then, the second limit switch arranged on the endless belt side detects the work pressing force with that sensor and inputs the signal generated at the preset pressing force to the control circuit as an endless belt lowering stop command to move the lifting cylinder. Stop and stop lowering the endless belt.

[0006]

1 is a side view explanatory view showing an embodiment of a work feeding device of the present invention, and FIG. 2 is a side view explanatory view of the work feeding device of FIG. 1 at a different time point. In the figure, 1 is a work feeding device, 2 is a caterpillar chain, 3 is an endless belt, 4 is a work, 5 is a lifting mechanism, 51 is a cylinder of the lifting mechanism 5, 6 is a first limit switch, and 61 is a first limit switch 6. Sensor, 7 is the second limit switch, 7
1 is a sensor of the second limit switch 7, 8 is a control panel, 9
Is a solenoid valve. As shown in FIG. 1, a work feeding device 1 of this embodiment has a caterpillar chain 2 driven in a horizontal position.
And a work pressing endless belt 3 having an elevating structure arranged above it. The work 4 rests on the upper surface of the caterpillar chain 2 and the endless belt 3
Is pressed against the lower surface of the paper and sent laterally. Endless belt 3
Is attached to the elevating mechanism 5 in order to elevate and lower its main body in the vertical direction. The lifting mechanism 5 includes a double-acting cylinder 51 and a guide rail 52 arranged on the frame of the main body of the caterpillar chain 2. The cylinder 51 is attached to the guide rail 52 side as an air cylinder in this case, and the lower end of the spindle is attached to the endless belt 3. Connect to the body frame of.

The caterpillar chain 2 is arranged in a horizontal position and driven by a continuously variable transmission directly-connected motor (not shown). The combination of caterpillar chain 2 and endless belt 3 is
For example, two sets are arranged on the left and right sides of the table of the double sizer with variable placement widths, but only one set is shown in FIGS. 1 and 2. In addition to the cylinder 51, the work feed device 1 includes a first limit switch 6 and a second limit switch 7. The first limit switch 6 controls the start of the descent of the endless belt 3 in response to the entry of the work 4. The first limit switch 6 is equipped with a sensor 61 for detecting the entry of the work 4 into the work feeding device 1, and is attached to the caterpillar chain 2. A sensor 61 in the form of a lever with a roller is arranged so as to project slightly above the height of the work 4 mounting surface. The other second limit switch 7 is
When the endless belt 3 presses the work 4 with a preset pressing force, the endless belt 3 is controlled so as to stop descending, and a lever with a roller that detects the height of the endless belt 3 relative to the upper surface of the work 4 is detected. A sensor 71 in the form of a model is attached, and this sensor 71 is arranged at substantially the same height as the pressing surface of the endless belt 3. Each signal from the first limit switch 6 and the second limit switch 7 is input to the control panel 8, and the cylinder 51 is controlled by the solenoid valve 9 which operates according to the instruction from the control panel 8. That is, the operation of the cylinder 51 is controlled based on the signals from the first limit switch 6 and the second limit switch 7.

The work feeding device 1 of this embodiment is constructed as described above, and at the start of operation, as shown in FIG.
When the work 4 is sent by the caterpillar chain 2, the sensor 61 of the first limit switch 6 detects the approach of the work 4, and the descent of the endless belt 3 is started as described above. The endless belt 3 reaches the upper surface of the work 4,
When it is further lowered, the pressing spring on the back of the endless belt is compressed, and when the pressing force due to the spring repulsion force reaches the set value,
When the sensor 71 of the second limit switch 7 detects the height of the relationship between the endless belt 3 and the work 4, the descent of the endless belt 3 is stopped as described above. That is, in this case, the pressing force of the endless belt 3 is detected by replacing it with the height of the relationship between the endless belt 3 and the work 4. In the case of a setup change in which the work 4 becomes high, the endless belt 3 is once lifted and then the descent start / stop control is performed. Also, as shown in FIG. 2, when the work 4 is lowered in height due to variations during the feeding operation of the work 4 and the pressing force of the endless belt 3 deviates from the permissible range, the relational height between the endless belt 3 and the work 4 increases. Because it changes
The sensor 71 of the second limit switch 7 changes from the ON state to the OFF state, for example. At this time, if the sensor 61 of the first limit switch 6 detects that the work 4 is on the caterpillar chain 2, the cylinder 51 is
The descent of the endless belt 3 is started again. As described above, the lowering of the endless belt 3 is stopped when it is detected that the related height set by the sensor 71 of the second limit switch 7, that is, the set pressing force is obtained. In this way, even when the height of the work 4 changes due to variations, the lifting control of the endless belt 3 is performed as at the start of the operation.

Therefore, even if the height of the work 4 changes due to setup changes or variations, the work feeding device 1 automatically performs follow-up control to always feed the set pressing force,
Unlike the conventional equipment, it is not necessary to adjust the height of the endless belt each time. In addition, since the cylinder 51 ascends and descends, there is no backlash, a stable height can be determined, and the machining accuracy is not adversely affected.
Moreover, the structure is simple and there are few failures.

The work feeding device of the present invention can be modified in various ways other than the above embodiment. For example, the sensor of each limit switch may be of a non-contact type such as a photoelectric type, a piezoelectric type, an electrostatic type, etc. to make it easier to handle.

[0011]

According to the work feeding device of the present invention,
Even if the height of the work changes, the height of the endless belt can be adjusted quickly and surely, and it is possible to feed with a constant pressing force, so stable processing is possible. Moreover, the structure is simple and there are few failures.

[Brief description of drawings]

FIG. 1 is an explanatory side view of a work feeding device showing an embodiment of the present invention.

FIG. 2 is a side view explanatory view of the work feeding device of FIG. 1 at another time point.

[Explanation of symbols]

 1 Work Feed Device 2 Caterpillar Chain 3 Endless Belt 4 Work 5 Lifting Mechanism 6 First Limit Switch 7 Second Limit Switch 8 Control Panel 9 Solenoid Valve 51 Cylinder 61 Sensor 71 Sensor

Claims (1)

(57) [Scope of utility model registration request] 1. A caterpillar chain which is driven in a horizontal position, and a top surface of a work placed on the caterpillar chain is pressed.
Is placed above the caterpillar chain to
Combined with an endless belt with a lifting structure
It is a work feeding device which is arranged on the side of the caterpillar chain to prevent the work from entering.
A first sensor having a work entry sensor for detecting
The mitt switch and the endless belt are arranged on the endless belt side.
Does not press the upper surface of the work with a preset pressing force.
It has a work hold down detection sensor for detecting
The second limit switch and the first limit switch detect the entry of the work.
Then, the endless belt starts to descend, and
If the mitt switch detects a preset pressing force,
With a lifting cylinder that stops the endless belt from descending
A work feeding device characterized by being provided.